1.This series products: filter foam sponge has hung style filters which absorb on the wall of fish tank, use environmental protection sponge as filtration material. if use together with air pump, it can get double effects of adding oxygen and filtration, enhance the viability of fish. 2.We are a competitive manufacturer in the aquarium field. We are mainly engaged in the development, production and sales of aquarium filter media and various aquarium accessories. Our main products are: sponge filter, bio sponge, Japan mat, filter brush, bio ball, ceramic rings, active carbon, air stone, etc. We can produce products of various sizes, shapes, and colors according to your needs. Samples or drawings are welcome.